DE102013108698A1 - III-nitride device with high breakdown voltage - Google Patents
III-nitride device with high breakdown voltage Download PDFInfo
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Abstract
Eine Halbleitervorrichtung umfasst einen Halbleiterkörper, der ein Verbindungshalbleitermaterial auf einem Substrat aufweist. Das Verbindungshalbleitermaterial weist einen Kanalbereich auf. Ein Source-Bereich erstreckt sich zu dem Verbindungshalbleitermaterial. Ein Drain-Bereich erstreckt sich ebenfalls zu dem Verbindungshalbleitermaterial und ist durch den Kanalbereich von dem Source-Bereich beabstandet. Ein Isolationsbereich ist in einem aktiven Bereich der Halbleitervorrichtung zwischen dem Verbindungshalbleitermaterial und dem Substrat in den Halbleiterkörper eingebettet. Der aktive Bereich umfasst die Source, die Drain und den Kanalbereich der Vorrichtung. Der Isolationsbereich ist über eine Länge des Kanalbereichs zwischen dem Source-Bereich und dem Drain-Bereich diskontinuierlich.A semiconductor device includes a semiconductor body having a compound semiconductor material on a substrate. The compound semiconductor material has a channel region. A source region extends to the compound semiconductor material. A drain region also extends to the compound semiconductor material and is spaced apart from the source region by the channel region. An insulation region is embedded in an active region of the semiconductor device between the compound semiconductor material and the substrate in the semiconductor body. The active area includes the source, drain and channel area of the device. The isolation region is discontinuous over a length of the channel region between the source region and the drain region.
Description
TECHNISCHES GEBIET TECHNICAL AREA
Die vorliegende Erfindung betrifft III-Nitrid-Vorrichtungen und genauer III-Nitrid-Vorrichtungen mit hoher Durchbruchspannung. The present invention relates to III-nitride devices, and more particularly to high-breakdown voltage III-nitride devices.
ALLGEMEINER STAND DER TECHNIK GENERAL PRIOR ART
Auf Galliumnitrid (GaN) beruhende Transistoren mit hoher Elektronenbeweglichkeit (HEMTs) sind aufgrund einer großen Bandenergielücke von 3,4 eV bei GaN gut als Vorrichtungen mit hoher Durchbruchspannung geeignet. Das bedeutet, dass kleinere Vorrichtungslängen vergleichsweise größeren Sperrspannungen widerstehen können, was zu einem niedrigeren Einschalt-Widerstand und einer niedrigeren Kapazität führt. Aufgrund der epitaktischen Herstellung, die verbreitet zur Herstellung von mehrschichtigen HEMT-Aufbauten verwendet wird, sind die meisten herkömmlichen HEMTs Vorrichtungen mit lateralem Source-Drain mit einem optionalen leitfähigem Plug, der sich durch den III-Nitrid-Epitaxiestapel erstreckt, um eine quasivertikale Vorrichtung bereitzustellen. Die Dicke des III-Nitrid-Epitaxiestapels eines derartigen Aufbaus muss der gleichen Sperrspannung wie die laterale Sperrspannung der Source-Drain-Strecke widerstehen. Gallium nitride (GaN) based high electron mobility transistors (HEMTs) are well suited as high breakdown voltage devices due to a large bandgap of 3.4 eV for GaN. This means that smaller device lengths can withstand comparatively larger blocking voltages, resulting in lower turn-on resistance and lower capacitance. Due to the epitaxial fabrication commonly used to fabricate multi-layered HEMT structures, most conventional HEMTs are lateral source-drain devices with an optional conductive plug extending through the III-nitride epitaxial stack to provide a quasi-vertical device , The thickness of the III-nitride epitaxial stack of such a structure must withstand the same blocking voltage as the lateral blocking voltage of the source-drain path.
Die Spannungsklasse einer herkömmlichen HEMT-Vorrichtung kann durch Verändern der Epitaxiedicke eingestellt werden. Diese Verfahren erfordern eine lange und teure Abscheidung von GaN-Schichten, was während der Hochtemperaturbearbeitung eine deutliche Waferdurchbiegung verursacht. Daher kann bei jeder post-epitaktischen Bearbeitung nur ein begrenzter Temperaturhaushalt angewendet werden, wodurch die Möglichkeit für eine Implantierung/Aktivierung des Source/Drain-Bereichs mit n+ möglicherweise beseitigt wird. The voltage class of a conventional HEMT device can be adjusted by changing the epitaxial thickness. These methods require a long and expensive deposition of GaN layers, causing significant wafer deflection during high temperature processing. Therefore, only a limited temperature budget can be applied to each post-epitaxial processing, potentially eliminating the possibility of implanting / activating the source / drain region with n +.
Das Substrat unter dem lateralen GaN-HEMT kann entfernt werden, um die Durchbruchspannungsfestigkeit der Vorrichtung zu erhöhen. Doch das Entfernen des Substrats ist bei Vorrichtungen mit großer Leistung aufgrund einer endgültigen Vorrichtungsdicke von nur wenigen Mikrometern eher schwer zu erreichen. Zusätzlich wird eine im Allgemeinen flache Vorrichtungsrückseite bevorzugt, um eine gute Wärmeanbindung mit dem Leiterrahmen bereitzustellen, was die Verwendung von tiefen Gräben unter dem Driftgebiet verhindert. The substrate under the lateral GaN HEMT can be removed to increase the breakdown withstand voltage of the device. However, removal of the substrate is rather difficult to achieve with high power devices due to a final device thickness of only a few microns. Additionally, a generally flat device back is preferred to provide good thermal bonding to the lead frame, which prevents the use of deep trenches below the drift region.
KURZDARSTELLUNG DER ERFINDUNG BRIEF SUMMARY OF THE INVENTION
Nach den hier beschriebenen Ausführungsformen wird die Epitaxiedicke einer III-Nitrid-Vorrichtung ohne nachteilige Auswirkung auf die Durchbruchspannung der Vorrichtung verringert, indem ein Teil der Epi-Schicht und/oder des darunterliegenden Substrats durch einen Isolationsbereich ersetzt wird. According to the embodiments described herein, the epitaxial thickness of a III-nitride device is reduced without adversely affecting the breakdown voltage of the device by replacing a portion of the epi-layer and / or the underlying substrate with an isolation region.
Nach einer Ausführungsform einer Halbleitervorrichtung umfasst die Halbleitervorrichtung einen Halbleiterkörper, der ein Verbindungshalbleitermaterial auf einem Substrat umfasst. Das Verbindungshalbleitermaterial weist einen Kanalbereich auf. Ein Source-Bereich erstreckt sich zu dem Verbindungshalbleitermaterial. Ein Drain-Bereich erstreckt sich ebenfalls zu dem Verbindungshalbleitermaterial und ist durch den Kanalbereich von dem Source-Bereich beabstandet. Ein Isolationsbereich ist in einem aktiven Bereich der Halbleitervorrichtung zwischen dem Verbindungshalbleitermaterial und dem Substrat in den Halbleiterkörper eingebettet. Der aktive Bereich umfasst die Source, die Drain und den Kanalbereich der Vorrichtung. Der Isolationsbereich ist über eine Länge des Kanalbereichs zwischen dem Source-Bereich und dem Drain-Bereich diskontinuierlich. According to an embodiment of a semiconductor device, the semiconductor device comprises a semiconductor body comprising a compound semiconductor material on a substrate. The compound semiconductor material has a channel region. A source region extends to the compound semiconductor material. A drain region also extends to the compound semiconductor material and is spaced from the source region by the channel region. An isolation region is embedded in the semiconductor body between the compound semiconductor material and the substrate in an active region of the semiconductor device. The active region includes the source, drain and channel region of the device. The isolation region is discontinuous over a length of the channel region between the source region and the drain region.
Nach einer anderen Ausführungsform einer Halbleitervorrichtung umfasst die Halbleitervorrichtung ein Halbleitersubstrat und ein epitaktisches Verbindungshalbleitermaterial, das auf dem Halbleitersubstrat abgeschieden ist. Das epitaktische Verbindungshalbleitermaterial weist einen Kanalbereich und eine höhere Energiebandlücke als das Halbleitersubstrat auf. Ein erster dotierter Bereich erstreckt sich zu dem epitaktischen Verbindungshalbleitermaterial. Ein zweiter dotierter Bereich erstreckt sich ebenfalls zu dem epitaktischen Verbindungshalbleitermaterial und ist durch den Kanalbereich von dem ersten dotierten Bereich beabstandet. Ein Isolationsbereich ist unter dem Kanalbereich zwischen dem epitaktischen Verbindungshalbleitermaterial und dem Substrat angeordnet und erstreckt sich seitlich in eine Richtung, die parallel zu einer Hauptoberfläche des Halbleitersubstrats verläuft. Der Isolationsbereich ist über eine Länge des Kanalbereichs zwischen dem ersten und dem zweiten dotierten Bereich diskontinuierlich. According to another embodiment of a semiconductor device, the semiconductor device includes a semiconductor substrate and an epitaxial compound semiconductor material deposited on the semiconductor substrate. The epitaxial compound semiconductor material has a channel region and a higher energy band gap than the semiconductor substrate. A first doped region extends to the epitaxial compound semiconductor material. A second doped region also extends to the epitaxial compound semiconductor material and is spaced from the first doped region by the channel region. An isolation region is disposed below the channel region between the epitaxial compound semiconductor material and the substrate, and extends laterally in a direction parallel to a major surface of the semiconductor substrate. The isolation region is discontinuous over a length of the channel region between the first and second doped regions.
Nach einer Ausführungsform eines Verfahrens zur Herstellung einer Halbleitervorrichtung umfasst die Halbleitervorrichtung das Bilden eines Halbleiterkörpers, der ein Verbindungshalbleitermaterial umfasst, auf einem Substrat, wobei das Verbindungshalbleitermaterial einen Kanalbereich aufweist; das Bilden eines Source-Bereichs, der sich zu dem Verbindungshalbleiterbereich erstreckt; das Bilden eines Drain-Bereichs, der sich zu dem Verbindungshalbleiterbereich erstreckt und durch den Kanalbereich von dem Source-Bereich beabstandet ist; und das Bilden eines Isolationsbereichs, der in einem aktiven Bereich der Halbleitervorrichtung zwischen dem Verbindungshalbleitermaterial und dem Substrat in den Halbleiterkörper eingebettet ist, wobei der aktive Bereich die Source, die Drain und den Kanalbereich umfasst. Der Isolationsbereich ist über eine Länge des Kanalbereichs zwischen dem Source-Bereich und dem Drain-Bereich diskontinuierlich. According to one embodiment of a method of manufacturing a semiconductor device, the semiconductor device comprises forming on a substrate a semiconductor body comprising a compound semiconductor material, the compound semiconductor material having a channel region; forming a source region extending to the compound semiconductor region; forming a drain region extending to the compound semiconductor region and spaced from the source region by the channel region; and forming an isolation region embedded in the semiconductor body between the compound semiconductor material and the substrate in an active region of the semiconductor device, the active region including the source, the drain and the drain Channel area includes. The isolation region is discontinuous over a length of the channel region between the source region and the drain region.
Fachleute werden beim Lesen der folgenden ausführlichen Beschreibung und beim Betrachten der beiliegenden Zeichnungen zusätzliche Merkmale und Vorteile erkennen. Those skilled in the art will recognize additional features and advantages upon reading the following detailed description and upon viewing the accompanying drawings.
KURZE BESCHREIBUNG DER ZEICHNUNGEN BRIEF DESCRIPTION OF THE DRAWINGS
Die Bestandteile in den Figuren sind nicht notwendigerweise maßstabgetreu; stattdessen wird die Betonung auf die Erläuterung der Grundsätze der Erfindung gelegt. Überdies bezeichnen in den Figuren gleiche Bezugszeichen entsprechende Teile. In den Zeichnungen: The components in the figures are not necessarily to scale; instead, emphasis is placed on explaining the principles of the invention. Moreover, like reference characters designate corresponding parts throughout the figures. In the drawings:
AUSFÜHRLICHE BESCHREIBUNG DETAILED DESCRIPTION
Als nächstes werden Ausführungsformen einer Verbindungshalbleitervorrichtung wie etwa eines Heterostruktur-Feldeffekttransistors (HFET) mit einer verringerten Epitaxiedicke, die die Durchbruchspannung der Vorrichtung nicht nachteilig beeinflusst, beschrieben. Der Ausdruck HFET wird gewöhnlich auch als HEMT (Transistor mit hoher Elektronenbeweglichkeit), MODFET (modulationsdotierter FET) oder MESFET (Metallhalbleiter-Feldeffekttransistor) bezeichnet. Die Ausdrücke "Verbindungshalbleitervorrichtung", "HFET", "HEMT", "MESFET" und "MODFET" werden hier austauschbar verwendet, um auf eine Vorrichtung zu verweisen, die einen Übergang zwischen zwei Materialien mit unterschiedlichen Bandlücken (d.h. einen Heteroübergang) als Kanal aufweist. Zum Beispiel kann GaAs mit AlGaAs kombiniert werden, kann GaN mit AlGaN kombiniert werden, kann InGaAs mit InAlAs kombiniert werden, kann GaN mit InGaN kombiniert werden usw. Außerdem können Transistoren Sperr-/Abstands-/Pufferschicht-Aufbauten aus AlInN/AlN/GaN aufweisen. Der hier verwendete Ausdruck "Verbindungshalbleitervorrichtung" kann sich auch auf einen Transistor beziehen, der unter Verwendung eines einzelnen epitaktischen Verbindungshalbleiters wie epitaktischem SiC hergestellt wurde. Next, embodiments of a compound semiconductor device such as a heterostructure field effect transistor (HFET) having a reduced epitaxial thickness that does not adversely affect the breakdown voltage of the device will be described. The term HFET is commonly referred to as HEMT (High Electron Mobility Transistor), MODFET (Modulation-doped FET), or MESFET (Metal Semiconductor Field Effect Transistor). The terms "compound semiconductor device", "HFET", "HEMT", "MESFET" and "MODFET" are used interchangeably herein to refer to a device having a junction between two materials having different bandgaps (ie, a heterojunction) as a channel , For example, GaAs can be combined with AlGaAs, GaN can be combined with AlGaN, InGaAs can be combined with InAlAs, GaN can be combined with InGaN, etc. In addition, transistors can have AlInN / AlN / GaN barrier / spacer / buffer layer constructions , The term "compound semiconductor device" as used herein may also refer to a transistor made using a single epitaxial compound semiconductor such as epitaxial SiC.
In jedem Fall ist die Epitaxiedicke der Verbindungshalbleitervorrichtung verringert, ohne die Durchbruchspannung der Vorrichtung nachteilig zu beeinflussen, indem ein Teil der epitaktischen Schicht (kurz "Epi-Schicht") und/oder des darunterliegenden Substrats durch einen Isolationsbereich ersetzt ist. Dies verringert die Gesamtkosten der Vorrichtung und verringert die Komplexität der Hochtemperaturprozesse infolge einer Waferdurchbiegung, die durch eine dicke Epi-Schicht erzeugt werden kann. Für quasivertikale Vorrichtungsaufbauten kann ein stark leitfähiges Substrat verwendet werden, das typischerweise eine vergleichsweise dickere Epi-Schicht benötigen würde, um der gleichen Sperrspannung wie bei einer lateralen Ausgestaltung zu widerstehen. Die hier beschriebenen Techniken minimieren aufgrund der Verwendung eines Low-k-Materials (in Bezug auf die Dielektrizitätskonstante der Epi-Schicht) wie Siliziumoxid, Siliziumnitrid, Diamant usw. auch parasitäre Kapazitäten. In either case, the epitaxial thickness of the compound semiconductor device is reduced without adversely affecting the breakdown voltage of the device by replacing a portion of the epitaxial layer ("epi-layer") and / or the underlying substrate with an isolation region. This reduces the overall cost of the device and reduces the complexity of high temperature processes due to wafer sag that can be created by a thick Epi layer. For quasi-vertical device constructions, a highly conductive substrate may be used, which would typically require a relatively thicker epi-layer to withstand the same reverse bias as in a lateral configuration. The techniques described herein also minimize parasitic capacitances due to the use of a low-k material (in terms of the dielectric constant of the epi-layer) such as silicon oxide, silicon nitride, diamond, etc.
Die Halbleitervorrichtung umfasst einen Halbleiterkörper
Bei der GaN-Technologie führt das Vorhandensein von Polarisationsladungen und des Spannungseffekts zu der Ausführung eines zweidimensionalen Ladungsträgergases, das eine zweidimensionale Elektronen- oder Lochinversionsschicht ist, die durch eine sehr hohe Trägerdichte und Trägerbeweglichkeit gekennzeichnet ist. Ein derartiges zwei-dimensionales Ladungsträgergas wie 2DEG (zweidimensionales Elektronengas) oder 2DHG (zweidimensionales Löchergas) bildet den Kanalbereich
Die Verbindungshalbleitervorrichtung umfasst ferner an einem Ende einen Source-Bereich (S), der sich zu dem Verbindungshalbleitermaterial
Die Vorrichtung kann eine laterale Vorrichtung sein, bei der die Source, die Drain und das Gate auf der gleichen Oberfläche des Halbleiterkörpers
Die Verbindungshalbleitervorrichtung umfasst auch einen Isolationsbereich
In jedem Fall kann die Dicke des Verbindungshalbleitermaterials
In einer Ausführungsform umfasst der Isolationsbereich
In jedem Fall kann in dem inaktiven Bereich
Bei der GaN-Technologie wird der Graben bzw. werden die Gräben
Sowohl bei vollständig als auch bei teilweise ausgefüllten Hohlräumen
Alternativ kann der Hohlraum
Wie hier vorher beschrieben wurde, kann statt dessen ein kleinerer Graben
Ausdrücke, die sich auf den Raum beziehen, wie "unten", "unter", "niedriger", "über", "ober" und dergleichen werden zur Erleichterung der Beschreibung verwendet, um die Positionierung eines Elements in Bezug auf ein zweites Element zu erklären. Diese Ausdrücke sollen neben anderen Ausrichtungen als den in den Figuren dargestellten verschiedene Ausrichtungen der Vorrichtung umfassen. Ferner werden auch Ausdrücke wie "erst", "zweit" und dergleichen verwendet, um verschiedene Elemente, Bereiche, Abschnitte usw. zu beschreiben und sollen diese ebenfalls keine Beschränkung darstellen. Gleiche Ausdrücke beziehen sich über die Beschreibung hinweg auf gleiche Elemente. Terms relating to space, such as "down," "under," "lower," "above," "upper," and the like, are used to facilitate the description of positioning an element relative to a second element to explain. These expressions are intended to encompass, among other orientations, different orientations of the device than shown in the figures. Further, terms such as "first," "second," and the like are also used to describe various elements, regions, portions, etc., and are not intended to be limiting thereof. Like terms refer to like elements throughout the description.
Die hier benutzten Ausdrücke "haben", "enthalten", "beinhalten", "umfassen" und dergleichen sind unbestimmte Ausdrücke, die das Vorhandensein von angegebenen Elementen oder Merkmalen anzeigen, aber zusätzliche Elemente oder Merkmale nicht ausschließen. Sofern aus dem Kontext nicht etwas eindeutig Anderes hervorgeht, sollen die Artikel "ein", "eine", "der/die/das" die Einzahl- wie auch die Mehrzahlform umfassen. As used herein, the terms "have," "include," "include," "include," and the like are indefinite terms that indicate the presence of specified elements or features but do not preclude additional elements or features. Unless the context clearly indicates otherwise, the articles "a," "an," "the" include the singular as well as the plural forms.
In Anbetracht der obigen Bandbreite von Veränderungen und Anwendungen sollte sich verstehen, dass die vorliegende Erfindung nicht durch die obige Beschreibung eingeschränkt wird und auch nicht durch die beiliegenden Zeichnungen eingeschränkt wird. Stattdessen wird die vorliegende Erfindung nur durch die folgenden Ansprüche und ihre rechtlichen Äquivalente eingeschränkt. In view of the above range of changes and applications, it should be understood that the present invention is not limited by the above description, nor is it limited by the accompanying drawings. Instead, the present invention is limited only by the following claims and their legal equivalents.
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